Distinguishing AGN from starbursts as the origin of double-peaked Lyman-alpha emitters in the reionization era

H. Padmanabhan, A. Loeb
2021 Astronomy and Astrophysics  
We discuss the possible origin of the double-peaked profiles recently observed in Lyman-alpha emitters (LAEs) at the epoch of reionization (z 6.5) from obscured active galactic nuclei (AGN). In combining the extent of the Lyman-α near-zones estimated from the blue peak velocity offset in these galaxies, with the ionizing emissivity of quasars at z 6, we forecast the intrinsic UV and X-ray luminosities of the AGN needed to give rise to their double-peaked profiles. We also estimate the extent of
more » ... imate the extent of the obscuration of the AGN by comparing their luminosities to those of similar quasar samples at these epochs. Future X-ray and radio observations, as well as those with the James Webb Space Telescope, will be valuable tools to test the AGN contribution to the intergalactic-scale ionization zones of high-redshift LAEs.
doi:10.1051/0004-6361/202040107 fatcat:6jem3dri4jak5juf2wi46lfxk4